OCEAN CITY, Md. (WJZ) — Mysterious tremors shake people in Ocean City, Md. Fears of an earthquake or an explosion spread fast on social media.

We now know it wasn’t either of those things that caused the tremors.

Christie Ileto explains what really happened.

Emergency officials confirm it was a sonic boom that sent waves of concern to Marylanders on the Eastern Shore.

Mysterious noises along Maryland’s Eastern Shore are enough to shake residents up Thursday. But state emergency officials confirm on Twitter–it’s not an earthquake–but two supersonic flights originating from the Patuxent Naval Air Station.

The base couldn’t tell WJZ their exact takeoff or flight plan.

“If you look at our flight pattern and our maps, the sound — the way it travels and everything — it could reach up there,” said Connie Hempel, Naval Air Station.